biggest mistake of life...

hey friends many people do mistakes and do such kind of activities in life but for some it becomes the biggest mistake of their life. one of my friend was going to the beaches to just celebrate new year last year, all of his family and friends were refusing him not to go. but he was so much into going there and enjoy. but at the end what happened that he never came back, actually he was drowned in the beaches of Goa in India....
so is there any mistake of yours still bothers you and you feel that i should not have done that....